冷轧厂1780机组酸洗一段共设有()台热交换器，二段共设有()台热交换器，三段共设有()台热交换器，传热材料为()。
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Dr Wang requested that you mix alginate and take an impression．While measuring the water，you got involved in conversation and did not notice how warm ir was．This oversight will()
A. make the mix unstable
B. 1engthen the gelation time
C. not affect gelation time
D. shorten the gelation time
牙胶尖的主要成分是______和________。
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